Atlas Copco QAS 45 ID T4F NB Mobile Diesel Generator

The Atlas Copco QAS 45 ID T4F is a 45 kVA Tier 4 Final mobile diesel generator — the workhorse mid-size unit for rental fleets, telecom, oil & gas, and construction prime power. Isuzu 4LE2X diesel with Tier 4 Final DOC-only after-treatment, integrated 110% fluid containment, DeepSea 4520 controller, and a DOT towable trailer with no brakes.

Key Features

• 45 kVA / 36 kW prime power — Tier 4 Final compliant
• Engine: Isuzu 4LE2X diesel with DOC-only after-treatment
• DeepSea 4520 controller — full monitoring & diagnostics
• 110% spill-free fluid containment, 75-gallon polyethylene fuel tank
• Single-axle trailer, no brakes (NB) configuration
• Powder-coated galvannealed steel enclosure, 1400+ hours salt-spray tested
• Long fuel autonomy at 75% load

Ideal Applications

• Rental fleet prime power
• Telecom and broadcast back-up
• Construction site power
• Oil & gas wellhead service
• Event power and emergency standby

Specifications

About the QAS 45 ID T4F NB

The Atlas Copco QAS 45 ID T4F NB is a mobile diesel generator for prime power duties that need more capacity than the QAS 25. Its multi-voltage output lets you match the electrical configuration to the site, and the NB version comes on a no-brake trailer. The sound-attenuated enclosure is rated at 67 dB(A) at 23 ft (7 m) and 75% load. Monitoring and fault diagnosis are handled through the DeepSea controller, with service points accessible from one side for maintenance.

How the QAS 45 ID T4F NB compares

At 480V three-phase, the QAS 45 provides 36 kW / 45 kVA of prime power against 20 kW / 25 kVA from the smaller QAS 25 ID T4F NB. The fuel tank remains 75 gal on both models. Published autonomy is 31.4 hours for the QAS 45 and 48.2 hours for the QAS 25 at each generator's own 75% load, using 90% of tank volume. The QAS 45 supplies more power, but these runtimes are measured at different electrical loads across the generator range.

Questions about the QAS 45 ID T4F NB

Is 45 kVA the prime or standby rating?

The 45 kVA figure is the prime rating. At 480V three-phase, output is 36 kW / 45 kVA prime or 40 kW / 50 kVA standby, so use the rating that matches the intended operating duty.

What does NB mean?

NB means the no-brake trailer configuration. Choose this version when you need the trailer arrangement rather than the QAS line's skid-mounted unit.

Which engine and fuel does it use?

The generator uses an Isuzu 4LE2X diesel engine with Tier 4 Final emissions and DOC exhaust after-treatment. It requires ultra-low sulfur diesel.

Why Buy From A1 Compressor Warehouse

• Authorized Atlas Copco dealer — full factory warranty support.
• Free application sizing — call (803) 526-5797 or email sales@a1compressorwarehouse.com before you order.
• Same-day quotes on requests received before 3 PM ET. Next-business-day order processing.
• Direct-to-consumer pricing — no middleman markup.